Cases of word usage

1) a bag of skin in which urine collects in human and animal bodies (bladder)

2) one of two organs in the abdomen that separate urine from the blood (kidney)

3) (an act of passing) urine (pee)

4) (to pass) urine (piddle)

5) to pass urine (urinate)

6) very small; (as used by and to small children) urine (wee)